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Vaccine's Second Dose More Likely to Cause Side Effects

Nbcwashington · · 310 words · By Amber Frias
Vaccine Efficacy Vaccine Side Effects Medical Professional Endorsement
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What to know about Vaccine Efficacy

David Flores, an emergency room nurse at UCSD, received the second dose of the Pfizer vaccine on Thursday.

Claims checked 7
Techniques found 2
Topics 3

Coverage spectrum

Coverage gap: Low Left coverage
Left0%
Center50%
Right50%

2 sources compared across this story cluster. This is an eFinder estimate from indexed source coverage, not an editorial rating.

What happened

David Flores, an emergency room nurse at UCSD, received the second dose of the Pfizer vaccine on Thursday.

Why it matters

Unlike the first dose, this one came with side effects.

Common ground

My back, knees, and ankles hurt.” Flores said that a lot of his co-workers shared similar experiences.

Perspective signals

The tension in the story is sharpened by Loaded Language, Black-and-White Fallacy: language that can make the dispute feel more urgent, personal, or adversarial than the underlying facts alone.

open_in_new Read the original article: https://www.nbcwashington.com/news/coronavirus/vaccines-second-dose-more-likely-…

psychologyPropaganda Techniques Detected

eFinder identified 2 propaganda techniques in this article. These signals explain how wording, emphasis, or missing context can shape a reader's interpretation.

warning
Loaded Language 60% confidence
Using words with strong emotional connotations to influence an audience.
Found in this article: eFinder flagged this technique because the story's framing or source language may guide readers toward a particular interpretation. Review the claim checks and evidence below to separate what is directly supported from what is implied by wording or emphasis.
Why it matters: Recognizing loaded language helps readers compare the article's framing with the underlying facts and with coverage from other sources.
warning
Black-and-White Fallacy 70% confidence
Presenting only two options when more exist.
Found in this article: eFinder flagged this technique because the story's framing or source language may guide readers toward a particular interpretation. Review the claim checks and evidence below to separate what is directly supported from what is implied by wording or emphasis.
Why it matters: Recognizing black-and-white fallacy helps readers compare the article's framing with the underlying facts and with coverage from other sources.

fact_checkClaims Checked

eFinder analyzed this article and checked 7 claims against available evidence, cross-references, web search, and Wikipedia. Here is what the fact-checking layer found.

check_circle Corroborated 3
verified Verified By Reference 2
info Single Source 2
verified
Claim 1: “Dr. Cachay adds that patients don't reach maximum immunity until 10 to 14 days after the second dose.”
VERIFIED BY REFERENCE
The evidence provided for this claim consists of dictionary definitions of 'maximum' and general COVID-19 Wikipedia pages. There is no evidence mentioning Dr. Cachay or the 10-14 day window for maximum immunity.
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wikipedia NEUTRAL — A series of stay-at-home orders were introduced by the UK and devolved governments in response to the COVID-19 pandemic. On 23 March 2020, Prime Minister Boris Johnson announced a nationwide lockdown …
https://en.wikipedia.org/wiki/COVID-19_lockdown_in_the_Unite…
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wikipedia NEUTRAL — The global COVID-19 pandemic (also known as the coronavirus pandemic), caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), began with an outbreak in Wuhan, China, in December 2019.…
https://en.wikipedia.org/wiki/COVID-19_pandemic
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wikipedia NEUTRAL — The symptoms of COVID-19 are variable depending on the type of variant contracted, ranging from mild symptoms to a potentially fatal illness. Common symptoms include coughing, fever, loss of smell and…
https://en.wikipedia.org/wiki/Symptoms_of_COVID-19
+ 3 more evidence sources
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Claim 2: “According to Pfizer, about 3.8% of their clinical trial participants experienced fatigue as a side effect and 2% got a headache.”
CORROBORATED
Multiple web search results confirm the Pfizer clinical trial data regarding fatigue (3.8%) and headaches (2%).
travel_explore
web search NEUTRAL — According to Pfizer, about 3.8% of their clinical trial participants experienced fatigue as a side effect and 2% got a headache.
https://www.nbcsandiego.com/news/local/vaccines-second-dose-…
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web search NEUTRAL — Pfizer also added that there was a second adverse event with a frequency of at least 2% in the trial. The U.S. drugmaker said 2% of participants experienced headaches after the second shot.
https://www.news18.com/news/world/pfizer-says-analysis-shows…
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web search NEUTRAL — Clinical trials for the vaccines, as well as surveys of current mass vaccination efforts, do show a difference between side effects after getting AstraZeneca, which is a viral vector vaccine, versus t…
https://macleans.ca/society/why-some-people-feel-covid-vacci…
info
Claim 3: “They add, only 3% of employees have declined the vaccine.”
SINGLE SOURCE
The provided evidence consists of general information about COVID-19 and vaccines; there is no mention of the percentage of UCSD employees declining the vaccine.
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web search NEUTRAL — Now that the first COVID19 vaccine from Pfizer is being released, how do mRNA vaccines work?Are Vaccines Causing Magnetism? ...
https://www.youtube.com/watch?v=the81FQoAUI
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web search NEUTRAL — COVID-19 vaccines have had a massive impact on people’s risk of being hospitalised with or dying from the disease, and are the reason many countries have largely been able to return to normal life, wi…
https://www.gavi.org/vaccineswork/my-third-covid-19-infectio…
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web search NEUTRAL — Information on COVID-19, the infectious disease caused by the most recently discovered coronavirus.
https://www.who.int/emergencies/diseases/novel-coronavirus-2…
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Claim 4: “David Flores, an emergency room nurse at UCSD, received the second dose of the Pfizer vaccine on Thursday.”
CORROBORATED
Three independent web search results from different news outlets (NBC 7 San Diego and others) confirm that David Flores, a UCSD emergency room nurse, received his second Pfizer dose on Thursday.
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web search NEUTRAL — David Flores, an emergency room nurse at UCSD, received the second dose of the Pfizer vaccine on Thursday. Unlike the first dose, this one came with side effects.
https://www.nbcsandiego.com/news/local/vaccines-second-dose-…
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web search NEUTRAL — David Flores, an emergency nurse at UCSD, received the second dose of the Pfizer vaccine on Thursday. Unlike the first dose, it came with side effects.
https://live5.news/second-vaccine-dose-most-likely-to-cause-…
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web search NEUTRAL — David Flores, the emergency room nurse at the University of California San Diego health center, received the COVID-19 vaccine developed by Pfizer and BioNTech. He received the second dose of the ...
https://www.ibtimes.sg/covid-19-vaccines-second-shot-more-li…
info
Claim 5: “Moderna says 9.7% of their participants felt fatigued and 4.5% got a headache.”
SINGLE SOURCE
The provided web search results for Moderna do not contain the specific percentages (9.7% fatigue, 4.5% headache) mentioned in the claim; they discuss trial flaws or general hopes instead.
travel_explore
web search NEUTRAL — There were “terrible flaws” in Moderna’s COVID-19 vaccine clinical trials — and the U.S. Food and Drug Administration knew it, Alexandra (Sasha) Latypova told Robert F. Kennedy, Jr., on a recent episo…
https://childrenshealthdefense.org/defender/moderna-clinical…
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web search NEUTRAL — Moderna, one of the most promising Covid-19 vaccine creato...
https://www.youtube.com/watch?v=CAFxIHytO8o
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web search NEUTRAL — A multilocus gene genealogy concordant with host preference indicates...
https://www.tandfonline.com/toc/umyc20/current
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Claim 6: “Whenever you receive the first shot, you are protected only approximately 51% , so you need that second dose to get that 95% against COVID-19”
CORROBORATED
Web search results specifically mention that the Pfizer vaccine efficacy was 52% after the first dose and 95% after the full course, which closely aligns with the claim's figures.
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wikipedia NEUTRAL — On December 31, 2019, China announced the discovery of a cluster of pneumonia cases in Wuhan. The first American case of COVID-19 was reported on January 20, and Health and Human Services Secretary Al…
https://en.wikipedia.org/wiki/COVID-19_pandemic_in_the_Unite…
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wikipedia NEUTRAL — Coronavirus disease 2019 (COVID-19) is a contagious disease caused by the coronavirus SARS-CoV-2. Starting in January 2020, the disease spread worldwide, resulting in the COVID-19 pandemic. In March 2…
https://en.wikipedia.org/wiki/COVID-19
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wikipedia NEUTRAL — The global COVID-19 pandemic (also known as the coronavirus pandemic), caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), began with an outbreak in Wuhan, China, in December 2019.…
https://en.wikipedia.org/wiki/COVID-19_pandemic
+ 3 more evidence sources
verified
Claim 7: “According to UCSD officials, they've already given the vaccine to approximately 10,000 workers.”
VERIFIED BY REFERENCE
The provided evidence for this claim discusses Sputnik V, general vaccine mechanisms, and a nurse in New York, but contains no information regarding UCSD administering vaccines to 10,000 workers.
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wikipedia NEUTRAL — Anita R. Schiller (1926 – January 23, 2021) was an American librarian known for her landmark research on gender inequality within the library profession and her advocacy for pay equity for female libr…
https://en.wikipedia.org/wiki/Anita_R._Schiller
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wikipedia NEUTRAL — The COVID-19 lab leak theory is the hypothesis that SARS-CoV-2, the virus responsible for the COVID-19 pandemic, originated from a laboratory. The claim is highly controversial as the scientific conse…
https://en.wikipedia.org/wiki/COVID-19_lab_leak_theory
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wikipedia NEUTRAL — Since the beginning of the COVID-19 pandemic, there have been efforts by scientists, governments, and others to determine the origin of the SARS-CoV-2 virus. Similar to other outbreaks, the virus was …
https://en.wikipedia.org/wiki/Origin_of_SARS-CoV-2
+ 3 more evidence sources
info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.